package com.lagou.dao.impl;

import com.lagou.dao.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

/*
* 课程内容管理 Dao层实现类
* */
public class CourseContentDaoImpl implements CourseContentDao {

    //根据课程id 查询课程相关信息
    @Override
    public List<Course_Section> findSectionAndLessonByCourseId(int courseId) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="SELECT\n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_section WHERE course_id=?";

            //3.执行查询
            List<Course_Section> sectionList = qr.query(sql, new BeanListHandler<Course_Section>(Course_Section.class), courseId);

            //4.根据章节id 查询课时信息
            for (Course_Section section : sectionList) {

                //调用方法 获取章节对应的课时
                List<Course_Lesson> lessonList = findLessonBySectionId(section.getId());

                //将课时数据封装到 章节对象中
                section.setLessonList(lessonList);
            }
            return sectionList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据章节id 查询章节相关的课时信息
    @Override
    public List<Course_Lesson> findLessonBySectionId(int sectionId) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="SELECT\n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_lesson WHERE section_id=?";

            //3.执行查询
            List<Course_Lesson> lessonList = qr.query(sql, new BeanListHandler<Course_Lesson>(Course_Lesson.class), sectionId);
            return lessonList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据课程id 回显课程信息
    @Override
    public Course findCourseByCourseId(int courseId) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="SELECT id,course_name FROM course WHERE id=?";

            //3.执行查询
            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), courseId);

            //4.返回结果
            return course;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //保存章节信息
    @Override
    public int saveSection(Course_Section section) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="\n" +
                    "INSERT INTO course_section(\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time) VALUES(?,?,?,?,?,?,?)";

            Object[] param={section.getCourse_id(),section.getSection_name(),section.getDescription(),section.getOrder_num(),
                            section.getStatus(),section.getCreate_time(),section.getUpdate_time()};
            int row = qr.update(sql, param);

            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }


    //修改章节
    @Override
    public int updateSection(Course_Section section) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="UPDATE course_section SET\n" +
                    "section_name=?,\n" +
                    "description=?,\n" +
                    "order_num=?,\n" +
                    "update_time=? WHERE id=?";

            //3.设置参数
            Object[] param={section.getSection_name(),section.getDescription(),section.getOrder_num(),section.getUpdate_time(),section.getId()};

            //4.传入参数
            int row = qr.update(sql, param);

            //5.返回结果
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }


    //修改章节状态
    @Override
    public int updateSectionStatus(int id, int status) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="UPDATE course_section SET\n" +
                    "STATUS=?,\n" +
                    "update_time=?\n" +
                    "WHERE id=?";

            //3.设置参数
            Object[] param={status, DateUtils.getDateFormart(),id};

            //4.传入参数
            int row = qr.update(sql, param);

            //5.返回结果
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //保存课时信息
    @Override
    public int saveLesson(Course_Lesson lesson) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="INSERT INTO course_lesson(\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time) VALUES(?,?,?,?,?,?,?,?,?)";

            //3.设置参数
            Object[] param={lesson.getCourse_id(),lesson.getSection_id(),lesson.getTheme(),lesson.getDuration(),lesson.getIs_free(),
                    lesson.getOrderNum(),lesson.getStatus(),lesson.getCreate_time(),lesson.getUpdate_time()};

            //4.传入参数
            int row = qr.update(sql, param);

            //5.返回结果
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改课时信息
    @Override
    public int updateLesson(Course_Lesson lesson) {

        try {
            //1.创建QueryRunner
            QueryRunner qr=new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql="UPDATE course_lesson SET\n" +
                    "section_id=?,\n" +
                    "theme=?,\n" +
                    "duration=?,\n" +
                    "is_free=?,\n" +
                    "order_num=?,\n" +
                    "update_time=? WHERE id=?";

            //3.设置参数
            Object[] param={lesson.getSection_id(),lesson.getTheme(),lesson.getDuration(),lesson.getIs_free(),lesson.getOrderNum(),lesson.getUpdate_time(),lesson.getId()};

            //4.传入参数
            int row = qr.update(sql, param);

            //5.返回结果
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
